Water heater turns on and off rapidly when a small amount of hot water is drawn (short cycling).

Safety: Water temperature may spike during cycling. Use caution.

• Increase flow: Open the hot tap fully during testing to keep flow above the minimum activation rate.
• Clean restrictions: Remove and clean faucet aerators and showerheads to improve flow.
• Check inlet filter: Clean the heater’s inlet filter screen to reduce pressure drop.
• Adjust usage: Avoid using the heater with ultra-low-flow fixtures below the manufacturer’s minimum flow rating. Consider upgrading fixtures or consulting Stiebel Eltron for low-flow configuration options.